KT. .John's- woiiT fa.milv. 83 



••-i- -tH- Pod plainly l-celled, xoith ?> parietal placenta;. 

 = Leaves very narraio. 



H. dolabrifdrme, Vent. Branched from decumbent base 6'-20' high ; 

 leaves lintar-hinceolate, nio.stly acute; cyme few flowered, leafy ; sepals 

 oblong or ovate-lanceolate, A' long ; pod ovate-conic, pointed. Ky. and 

 Tenn. 



H. cistif61ium. Lam. Cistus-leavet> S. Nearly simple, l°-2° high ; 



leaves diverging, oblong- linear (2' long), mostly obtuse ; flowers numerous, 



small, in a naked flat cyme ; sepals ovate ; pod globular. Kocky banks, 



O. to Iowa and S. r n- ,■ i 



= = Leaves elliptic or nearly ovate. 



H. ellipticum. Hook. Elliptical-leaved S. 10'-20' high ; leaves 

 spreading, oblong, thin ; flowers rather few, pale ; sepals oblong ; the pod 

 purple, ovoid, very obtuse. Wet soil, N. 



H. virgatum, Lam. BnANCHY" S. AVet pine barrens from New Jersey 

 S. Stem sharply 4-angled (l°-2° high), smooth; leaves ovate or lance- 

 oblong ; flowers scattered along the ascending branches of the cyme, 

 small, coi)per-yellow ; styles slender. 



H. pil6sum, Walt. Hairy S. Wet pine barrens S. Stem terete, 

 and with the lance-ovate leaves rough ish-downy ; styles short. 



* * * tStamens many in 3 or 5 clusters ; styles 3, not united ; petals with 



black dots, il 



H. perforatum, Linn. Common S. Upright stems branching ; leaves 

 oblong or linear-oblong, with pellucid dots ; flowers rather large, in open 

 leafy cymes ; the deep yellow petals twice the length of the lanceolate, 

 acute sepals ; juice very acrid. Nat. from Eu., a troublesome weed in 

 fields, etc. ; spreads by runners from the base. 



H. maculatum, Walt. Spotted S. Stem 2° high, sparingly branched ; 

 leaves oDlong, slightly clasping, having black as well as pellucid dots ; 

 flowers rather small, crowded ; petals light yellow and black-lined as well 

 as dotted ; sepals oblong ; styles not longer than the pod. Common. 



* * * * Stamens definite {5-]2) , distinct or in 3 clusters; styles 3, not 



united; stems 4-angled. 



-1- Leaves conspicuous and spreading ; flowers in cymes. 



H. mtitilum, Linn. Small S. Slender, much-branched and leafy up 

 to the flowers, (i'-20' high ; leaves partly clasping, thin, 5-nerved, ovate 

 or oblong ; ]>etals i)ale yellow. Common in low grounds. 



H. gymnanthum, Engelm. & Gray. Stem almost simple, strict, l°-3° 

 high ; leaves rlasjiiiig, the floral ones reduced to awl-shaped bracts. 



H. Canadense, Linn. Stem and branches strictly erect ; leaves linear 

 or lanceolate, ;;-ncrv('d at the base ; petals copper-yellow. Wet sandy soil. 



■^- -t- Leaves erect, awl-shaped or scale-like and minute; flowers very 

 small and scattered along the numerous bushy and loiry slender branches. 



H. Drumm6ndii, Torr. & Gray. Leaves linear-awl-sliaped ; flowers 

 short-pcdicelcd ; ))ods not longer than the calyx. 111., W. and S. 



H. nudicatile, Walt. Orange Gkass or Pinewkkd. Leaves reduced to 

 minute, awl-shaped, appressed scales ; flowers sessile on the wiry branches ; 

 slender pods much exceeding the calyx. Common in dry, sterile .soil. 



3. ELODES, MAKSH ST. JOHN'S- WORT. (Greek: marsh.) 11 



E. campanuldta, Pursh. l°-2° high ; leaves closely sessile or clasp- 

 ing l)y a broad base ; filaments united below the middle. Swamps. 



E. petiolata, rur.sli. Taller ; leaves tapering into a short petiole ; 

 fllaments united beyond the middle. Va., S. and W. 



